Digital Commons Network^™

Effects Of Vertical Reinforcement On The Shear Performance Of Uhpc Deep Beams With Synthetic And Steel Fibres, Hossein Mirzaaghabeik, Sanjay Kumar Shukla, Nuha S. Mashaan

Research outputs 2022 to 2026

This study examines the shear behaviour of ultra-high-performance concrete deep beams (UHPC-DBs) reinforced with three fibre types: 2 % hooked-end (HE) steel fibres, 0.76 % 5D steel fibres, and 0.11 % Forta-Ferro (FF) synthetic fibres. It evaluates the effects of fibre type, fibre content, vertical web reinforcement (ρsv), and shear span-to-depth ratio (λ) on shear capacity. Load-deflection curves, crack patterns, and ρsv strain were analysed, and the optimal ρsv was determined using the particle swarm optimization (PSO) algorithm to maximise shear capacity while minimising costs. Findings reveal that, compared to specimens without ρsv, those with ρsv = 0.38 % exhibit …

Handling Socio-Institutional Traps–Inertia Towards Australia’S Resilient International Development Aid Programs In The Solomon Islands, Mark Opoku Amankwa, Kwadwo Adusei-Asante, Alina Novak

Research outputs 2022 to 2026

This study critically examines how donor’s aid delivery approach, entrenched socio-institutional dynamics, and the Solomon Islands’ complex political economy create persistent barriers to Australia’s aid programming. Through a desktop research approach, institutional trap–inertia theory is applied to analyze how Australia’s aid efforts and political structures perpetuate aid inertia. The study critiques both Australia’s aid delivery approach and the internal governance challenges in a cohesive society of the SI, highlighting their intertwined roles in impeding Australia’s aid programming. The article proffers context-driven, locally adaptive strategies aimed at overcoming institutional traps and fostering more resilient and effective aid interventions.

Higher Vitamin K1 Intakes Are Associated With Lower Subclinical Atherosclerosis And Lower Risk For Atherosclerotic Vascular Disease-Related Outcomes In Older Women, Montana Dupuy, Liezhou Zhong, Simone Radavelli-Bagatini, Jack Dalla Via, Kun Zhu, Lauren C. Blekkenhorst, James Webster, Nicola P. Bondonno, Allan Linneberg, Carl Schultz, Wai Lim, Richard L. Prince, Jonathan M. Hodgson, Joshua R. Lewis, Marc Sim

Research outputs 2022 to 2026

Purpose: Vitamin K may inhibit vascular calcification, a common attribute of atherosclerotic vascular diseases (ASVDs). We examined associations between dietary vitamin K1 intakes and both subclinical atherosclerosis and ASVD events, including hospitalisations and mortality, in older women.

Methods: 1,436 community-dwelling women (mean ± SD age 75.1 ± 2.7 years) were included. Vitamin K1 intakes were calculated from a validated food frequency questionnaire at baseline (1998), utilising a region-matched vitamin K food database. Common carotid artery intima–media thickness (CCA-IMT), a measure of subclinical atherosclerosis, was measured in 2001 (n = 1,090). Differences in CCA-IMT by quartiles (Q) of vitamin K1 intake …

Insights Into Prey Handling And Feeding Strategies By Ghost Crabs On Sea Turtle Eggs And Hatchlings, Casper Avenant

Research outputs 2022 to 2026

The feeding behaviour on sea turtle eggs and hatchlings by the golden ghost crab Ocypode convexa, a species endemic to the west coast of Australia, was observed in field and laboratory settings using infrared videography. On beaches where ghost crab densities are high, multiple crabs can feed on nests over several nights, often resulting in destruction of clutches. Crabs appear to anticipate the emergence of hatchlings, often congregating near nests in the moments prior to emergence. When feeding on eggs crabs rupture eggshells using the sharp tips of their claws, with tissue subsequently moved to the mouthparts for ingestion using …

The Effect Of Resistance Inspiratory Muscle Training In The Management Of Breathlessness In Patients With Thoracic Malignancies: A Randomised Controlled Trial, Meng Yuan Li, Xian Liang Liu, Bo Peng, Tao Wang, Li Qun Yao, Hou Qiang Huang, Wai Hang Kwok, Jing Yu Benjamin Tan, Alex Molassiotis

Research outputs 2022 to 2026

Purpose: To assess the effects of resistance inspiratory muscle training (IMT) on breathlessness in patients with thoracic malignancies. Methods: This is a two-arm, non-blinded, randomised controlled trial (RCT). A total of 196 participants were randomly assigned (1:1) into two groups: a control group (routine care) and an intervention group (routine care + IMT training using a pressure threshold device). The intervention duration was 12 weeks with 30 min/day, 5 days/week. The primary outcome was breathlessness severity, assessed by the modified Borg scale (mBorg). Secondary outcomes were worst and average breathlessness over the past 24 h (assessed by the 11-point Numerical …

Working With Patients Who Self-Injure: An Open Label Study Of An Educational Intervention To Upskill Emergency Nurses On Non-Suicidal Self-Injury, Penelope Hasking, Amanda Aiyana, Jonathon Burcham, Samantha Carey, Joanne M. Dickson, Daniel Fatovich, Logan Hopkins, Eme John, Shirley Mcgough, Chloe Mclean, Irene Ngune, Alex Wheeler

Research outputs 2022 to 2026

Non-suicidal self-injury (NSSI), deliberate damage to body tissue with no intent to die, is not engaged with suicidal intent but is the most reliable predictor of later suicidal behaviour. This makes efforts to reduce self-injury critical. Emergency departments can be the gateways to care for many people who have self-injured and optimal sites for interventions that promote recovery. However, emergency nurses have anecdotally reported that they lack training and feel ill-equipped to provide care for patients who self-injure. In this open label trial (where both participants and researchers were aware who received the intervention), all nurses in a metropolitan emergency …

A Predictive Model For The Shear Capacity Of Ultra-High-Performance Concrete Deep Beams Reinforced With Fibers Using A Hybrid Ann-Anfis Algorithm, Hossein Mirzaaghabeik, Nuha S. Mashaan, Sanjay Kumar Shukla

Research outputs 2022 to 2026

Ultra-high-performance concrete (UHPC) has attracted considerable attention from both the construction industry and researchers due to its outstanding durability and exceptional mechanical properties, particularly its high compressive strength. Several factors influence the shear capacity of UHPC deep beams, including compressive strength, the shear span-to-depth ratio (λ), fiber content (FC), vertical web reinforcement (ρsv), horizontal web reinforcement (ρsh), and longitudinal web reinforcement (ρs). Considering these factors, this research proposes a novel hybrid algorithm that combines an adaptive neuro-fuzzy inference system (ANFIS) with an artificial neural network (ANN) to predict the shear capacity of UHPC deep beams. To achieve this, ANN and …

Biological Age Acceleration Associated With The Progression Trajectory Of Cardio-Renal–Metabolic Multimorbidity: A Prospective Cohort Study, Yixing Tian, Jinqi Wang, Tianyu Zhu, Xia Li, Haiping Zhang, Xiaoyu Zhao, Xinghua Yang, Yanxia Luo, Lixin Tao, Zhiyuan Wu, Xiuhua Guo

Research outputs 2022 to 2026

Objectives: Previous studies have confirmed that biological age (BA) acceleration is associated with single cardio-renal–metabolic diseases (CRMDs), typically including type 2 diabetes mellitus, cardiovascular disease, and chronic kidney disease. However, its association with progression to cardio-renal–metabolic multimorbidity (CRMM, coexistence of ≥2 CRMDs) and subsequent mortality remains unexplored. Methods: Using the multi-state model, we analyzed 278,927 UK Biobank participants free of CRMDs at baseline to investigate the association between BA acceleration—measured by phenotypic age (PhenoAge) and Klemera–Doubal method age (KDMAge)—and CRMM progression trajectory, from health to the first CRMD and then to CRMM and death. BA acceleration was the residual from …

Developing An Inclusive Dance Guide For Children With Cerebral Palsy: A Co-Design Process And Initial Feasibility Study, Eduardo Duarte Machado, Laura Miller, Joanna Nicholas, Joanne Cross, Rhyannon Orr, Michael H. Cole

Research outputs 2022 to 2026

Background: Participation in community activities has shown positive outcomes for all children, yet those with cerebral palsy (CP) still experience varying levels of inclusion. This study aimed to address the challenges faced by families of children with CP in accessing community-based dance classes by co-designing a practical guide to support their inclusion. Design: The guide was developed through a collaborative process involving academic researchers, dance professionals, therapists and families of children with CP. The co-design phase was guided by the International Association for Public Participation (IAP2), workshops were conducted with 11 research partners, including two parents of children with CP, …

Does Pollination By Non-Flying Mammals Contribute Substantially To Fruit Set Of Banksia (Proteaceae)? A Test In Four Species With Contrasting Floral Traits, Stanislaw K. Wawrzyczek, Robert A. Davis, Siegfried L. Krauss, Susan E. Hoebee, Ryan D. Phillips

Research outputs 2022 to 2026

Pollination by non-flying mammals (NFMs) is thought to be associated with cryptic, dull coloured, strongly scented flowers. In Western Australia, various Banksia species exhibit these traits, suggesting adaptation to primary pollination by NFMs, particularly the marsupial honey possum (Tarsipes rostratus). Here, we compare floral visitation rates and assess contribution to fruit set of NFMs and other pollinators in four species of Banksia with contrasting floral traits. Camera trap-based surveys revealed that honeyeater birds visited all species equally and were more frequent visitors than NFMs to the brightly coloured, unscented flowers of B. sessilis and B. splendida. By contrast, NFMs were …

Finger Orthoses For Rehabilitation―Part I: Biomedical Insights And Additive Manufacturing Innovations, Alireza Nouri, Lijing Wang, Hamed Bakhtiari, Yuncang Li, Cuie Wen

Research outputs 2022 to 2026

Background: Finger orthoses are essential for treating injuries, deformities, and disorders of the upper limbs by supporting, immobilizing, or correcting deformities. Recent advances in three-dimensional (3D) printing have significantly enhanced precision and customization compared to traditional fabrication methods such as thermoplastic molding, plaster or fiberglass casting, and the use of prefabricated splints. Methods: The present review was conducted using PubMed, Scopus, and other databases with keywords such as “hand therapy”, “additive manufacturing”, “finger and thumb”, and “orthosis”. Only English-language publications were considered, with a primary focus on articles published between 2010 and 2025. Key themes were identified and categorized into …

Pre-Amplification Of Cell-Free Dna: Balancing Amplification Errors With Enhanced Sensitivity, Wei Yen Chan, Ashleigh Stewart, Russell J. Diefenbach, Elin S. Gray, Jenny H. Lee, Richard A. Scolyer, Georgina V. Long, Helen Rizos

Research outputs 2022 to 2026

Circulating tumour DNA (ctDNA) is a promising biomarker for personalised oncology. However, its clinical utility is limited by detection sensitivity, particularly in early-stage disease. T-Oligo Primed Polymerase Chain Reaction (TOP-PCR) is a commercial amplification approach utilising an efficient “half-adapter” ligation design and a single-primer-based PCR strategy. This study evaluated the clinical value and application of cell-free DNA (cfDNA) pre-amplification. cfDNA amplification with TOP-PCR preserved DNA size profiles and resulted in a 22 bp size increase due to the half-adaptor ligation. Gene target amplification rates varied, showing lower efficiency for the GC-rich TERT promoter amplicon and higher efficiency for the BRAF …

Robust Adaptive Fractional-Order Pid Controller Design For High-Power Dc-Dc Dual Active Bridge Converter Enhanced Using Multi-Agent Deep Deterministic Policy Gradient Algorithm For Electric Vehicles, Seyyed Morteza Ghamari, Daryoush Habibi, Asma Aziz

Research outputs 2022 to 2026

The Dual Active Bridge converter (DABC), known for its bidirectional power transfer capability and high efficiency, plays a crucial role in various applications, particularly in electric vehicles (EVs), where it facilitates energy storage, battery charging, and grid integration. The Dual Active Bridge Converter (DABC), when paired with a high-performance CLLC filter, is well-regarded for its ability to transfer power bidirectionally with high efficiency, making it valuable across a range of energy applications. While these features make the DABC highly efficient, they also complicate controller design due to nonlinear behavior, fast switching, and sensitivity to component variations. We have used a …

The Association Of Body Composition And Musculoskeletal Characteristics With Police Recruit Performance: A Cross-Sectional Study, Vanessa R. Sutton, Myles C. Murphy, Callum J. Mccaskie, Paola T. Chivers, Nicolas H. Hart, Jodie L. Cochrane Wilkie, Garth Allen, Jack Dalla Via

Research outputs 2022 to 2026

Objective: Exploring how body composition and musculoskeletal characteristics relate to physical performance may provide insights for optimising training outcomes. We explored if body composition and musculoskeletal characteristics were associated with tactical and cardiorespiratory performance.

Methods: A cross-sectional study of police recruits within the Western Australia Police Force was performed. Total and regional body composition was assessed using Dual-energy X-ray Absorptiometry, with the tibial morphology and mid-thigh muscle cross-sectional area assessed using peripheral Quantitative Computed Tomography. Tactical performance was measured with a Physical Performance Evaluation, and cardiorespiratory fitness assessed using the Beep Test. Variables that were significant in univariate regressions progressed …

The Role Of Stigma In Help-Seeking Strategies Among African Migrants In Australia: A Qualitative Study, Agness Tembo, Kathomi Gatwiri, Obed Adonteng-Kissi, Nnaemeka Meribe, Lillian Mwanri, Frank Darkwa Baffour, Edith N. Botchway-Commey, David Chisanga, Ahmed A. Moustafa, Samara Kim, Uchechukwu Levi Osuagwu

Research outputs 2022 to 2026

African migrants living in Western countries often report experiencing high levels of stress, trauma and mental health conditions due to migration-related challenges, including racial discrimination, social exclusion and economic hardships. This mixed-method study that sought to explore to This mixed-method study explored the help-seeking behaviours of Africans in Australia. The quantitative study engaged 167 participants, who completed an online survey, and the qualitative aspect involved an in-depth interview with 12 participants. This paper reports on the qualitative aspect of the study, which was seen as essential to gaining deep, rich insights into the everyday meaning-making processes of how African migrants …

Vitamin K: Metabolism, Genetic Influences, And Chronic Disease Outcomes, Montana Dupuy, Nicola P. Bondonno, Pratik Pokharel, Allan Linneberg, Itamar Levinger, Carl Schultz, Jonathan M. Hodgson, Marc Sim

Research outputs 2022 to 2026

Vitamin K refers to a group of lipid-soluble vitamins that exist in two natural isoforms; phylloquinone (PK, vitamin K1) and menaquinones (MKs, vitamin K2). Phylloquinone, the primary dietary source, is found abundantly in green vegetables and plant oils. Menaquinones (MK-4 through MK-13) are synthesized by anaerobic bacteria and may be obtained through the diet from fermented foods and animal products (e.g., meats, dairy and eggs). Originally recognized for its role in blood coagulation, vitamin K is an essential cofactor for the posttranslational carboxylation of vitamin K-dependent proteins (VKDPs), which are implicated in various physiological processes including; blood coagulation, calcium homeostasis, …

Paradoxical Leadership As Facilitator In The Idea Journey: The Role Of Regulatory Focus, Irene E. De Pater, Shenghui Wang, Ming Yi, Eric F. Rietzschel

Research outputs 2022 to 2026

Drawing upon theory and research on innovation, conservation of resources, and paradoxical leadership, we examine relationships between three stages of the innovative process (i.e., idea generation, idea dissemination, and idea implementation) and the role of paradoxical leadership as a facilitator of the transitions between these stages. In addition, we examine the motivational mechanisms (promotion and prevention focus) that can explain the relevance of paradoxical leadership in the innovative process. Results of a four-wave study show that paradoxical leadership, through employee promotion focus, strengthens the relationship between idea generation and idea dissemination, whereas paradoxical leadership, through employee prevention focus, strengthens the …

Cardiac Autonomic Dysfunction In Patients With Cancer: Exploring The Role Of Physical Exercise, Anita Borsati, Linda Toniolo, Christian Ciurnelli, Francesco Bettariga, Silvia Teresa Riva, Paolo Frada, Lorenzo Belluomini, Ilaria Trestini, Daniela Tregnago, Jessica Insolda, Marco Sposito, Federico Schena, Michele Milella, Robert U. Newton, Sara Pilotto, Alice Avancini

Research outputs 2022 to 2026

Purpose: Cardiovascular diseases are a leading cause of non-cancer mortality among patients with cancer, with cardiac autonomic dysfunction identified as a significant predictor of future cardiovascular conditions. Despite the importance of autonomic dysfunction as a prognostic marker being well-established in healthy individuals and other chronic conditions, its role in patients with cancer remains underexplored. This narrative review aims to synthesize existing literature on the role of cardiac autonomic dysfunction in patients with cancer and explore the potential of physical exercise as a non-pharmacological intervention to modulate the autonomic nervous system positively. Methods: This review examines methods for assessing cardiac autonomic …

Electrospun Membranes From Bio-Renewable Poly (Ethylene Furanoate)/Poly (Ethylene Teraphthalate) (Pef/Pet) Blend For Emulsification Application, Aya Ismat Sayed

Theses

This thesis focuses on manufacturing electrospun fibrous membranes from a blend of poly (ethylene terephthalate) and poly (ethylene furanoate) and using in premix emulsification. Poly (ethylene furanoate), which is a 100% bio-renewable polymer being blended with synthetic poly (ethylene terephthalate) for membrane fabrication contributes towards sustainability in the production of food and pharmaceutical emulsions. The primary objective of this research is to optimize the fabrication conditions of poly (ethylene terephthalate)/poly (ethylene furanoate) porous membranes, characterize their properties, and evaluate their performance in emulsification. This study compares poly (ethylene terephthalate) / poly (ethylene furanoate) blend membranes with individual poly (ethylene terephthalate) …

June 2025 News Releases, University Of Montana--Missoula. Office Of University Relations

University of Montana News Releases, 1928, 1956-present

No abstract provided.

A Comprehensive Science Mapping Of Tourism And Hospitality Research: Tribes, Territories And Networks, Songshan (Sam) Huang

Research outputs 2022 to 2026

This study aims to provide a comprehensive bibliographic analysis of the field of tourism and hospitality research by mapping the contributions of researchers, research institutions and evolution of research topics and collaboration networks. Metadata from 27 SSCI and 30 ESCI tourism and hospitality journals were collected from Web of Science. Data analysis was conducted utilizing R package of Bibliometrix and Biblioshiny, adhering to the guidelines of bibliometric analysis. The study identified topics of sustainability and IT technology applications in tourism and hospitality as the recent research fronts. An increasing number of Chinese origin researchers emerged in the author collaboration network, …

What Constitutes A Theoretical Contribution, Noel Scott

Research outputs 2022 to 2026

No abstract provided.

Extending The Psychometric Properties Of The Arabic Rcmas In Jordanian Children Aged 7–16: Considering Gender And Age Invariances, Mohammad A. Al Jabery, Ebenezer Afrifa-Yamoah, Sara Farid Khalaf, Diana H. Arabiat

Research outputs 2022 to 2026

Background: There are diverse gender and age-based differences in levels of anxiety between boys and girls. Establishing the validity of such assessments entails inquiry on the construct validity and measurement invariance of tools. This study examined the psychometric properties of the Arabic version of the Revised Children's Manifest Anxiety Scale (RCMAS) to assess its suitability for measuring child anxiety and its equivalence across genders and ages. Methods: A cross-sectional design was employed to examine the generalizability of the measure's structure. The study was conducted between November 2021 and January 2022. A sample of 178 children (86 boys and 92 girls), …

Multifunctional Prospects Of Physical Vapor-Deposited Silver-Based Metal-Dielectric Nanocomposite Thin Films, Mohammad Nur-E-Alam, Boon Kar Yap, Mohammad Khairul Basher, Mohammad Aminul Islam, M. Khalid Hossain, Manzoore Elahi M. Soudagar, Narottam Das, Mikhail Vasiliev, Tiong Sieh Kiong

Research outputs 2022 to 2026

Silver-based metallic thin-film nanostructured materials are extensively utilized in advanced technological applications, including sensors, energy-efficient coatings, antibacterial coatings, and optical filters. Physical vapor deposition has emerged as a significant technique for synthesizing silver (Ag)-based nanocomposites, enabling the modification of structural and optical properties of thin metallic films. This advancement facilitates material development and applications in electronics, catalysis, magnetics, optics, environmental and health sectors, and specialized optical coatings. Research has demonstrated the successful integration of various nanomaterials with Ag matrices, resulting in multifunctional thin-film systems. Ag-based nanocomposite thin films exhibit exceptional electrical conductivity, rendering them suitable for electronic and optoelectronic devices. …

Satellite And Eddy Covariance Analysis Reveals Short-Lived Evapotranspiration Changes After Fire In Mediterranean Woodland, Hoang Long Nguyen, Simone Gelsinari, J. Nik Callow, Richard Silberstein, Sally E. Thompson

Research outputs 2022 to 2026

Ecosystem evapotranspiration (ET) varies through space and time in response to environmental gradients and disturbances like fire. Field-based techniques (e.g. eddy covariance) can directly measure how ET responds to fire; however, these measurements are localised and only represent small areas. Remotely sensed ET products can potentially evaluate fire impacts on ecosystem ET, but their performance for this task remains largely unassessed. This paper uses three widely available remote sensing products: the CSIRO MODIS ReScaled ET (CMRSET), MODIS ET (MOD16), and Penman–Monteith–Leuning (PML), to assess ET changes caused by a fuel reduction burn in a Mediterranean woodland in comparison to the …

Ai-Powered Education: A Cross-Country Exploration Of Ai Literacy Among Hospitality And Tourism Educators, Anderson Ngelambong, Siao Fui Wong, Silverina Kibat, Nur'hidayah Che Ahmat, Noel Scott

Research outputs 2022 to 2026

While there is a growing acknowledgement of the importance of AI literacy in educational settings, there is a notable scarcity of specific studies focusing on the AI literacy levels of hospitality and tourism educators in the Asian region. Notably, this study explores the AI literacy levels and integration of AI technologies among hospitality and tourism educators. We interviewed 25 educators from Malaysia and China using a cross-country qualitative study approach to evaluate their mastery of AI tools, their integration of AI into their teaching, and their challenges. The results revealed notable differences in AI literacy between the two groups, with …

Investigation And Prediction Of Excessive Water Production In Bottom Water-Drive Naturally Fractured Reservoirs Using Machine And Deep Learning, Sami Abderraouf Belkhir

Theses

Naturally Fractured Reservoirs (NFRs) are characterized by dual-porosity and dual-permeability systems, posing significant challenges in managing water production due to highly conductive fracture networks that facilitate rapid water migration from bottom aquifers, often bypassing oil stored in the matrix, thus resulting in early water breakthrough and water channeling phenomena. The main objective of this thesis is to develop and validate deep learning and machine learning models to predict water production, water breakthrough time (tbt), and ultimate water cut (WCult) in NFRs, thereby enabling more effective reservoir management strategies. This work also aims to evaluate the sensitivity of water behavior to …

Exploring The Quality Of Professional Development In Addressing Challenges With Behavior Management Of Special Needs Students In Inclusive Classrooms: An Instrumental Case Study, Reem Hussein Abuwatfa

Theses

Inclusive education has become a major educational priority globally and within the United Arab Emirates (UAE), driven by policies promoting the full participation of students with special educational needs (SEN) in inclusive classrooms. This study explores how elementary-level general education teachers perceive the quality of professional development (PD) in addressing their challenges with behavior management of students with SEN in inclusive classrooms. A qualitative case study approach was used, utilizing semi-structured interviews. The findings indicated that teachers face challenges from the behavioral issues of SEN students in inclusive classrooms, affecting both typical peers and teachers. Moreover, teachers had mixed perceptions …

Associations Between Vitamin D Deficiency And Sociodemographic Factors, Lifestyle Behaviors, And Metabolic Conditions: A Cross-Sectional Study From The Hnnhs In Greece, Asmae Mohamad Sadek

Theses

Vitamin D deficiency (VDD) is a widespread global health concern associated with various sociodemographic, lifestyle, dietary, and metabolic factors. While previous studies examined VDD in Greece, few provided a comprehensive analysis across multiple determinants using representative national data. This study aimed to assess the prevalence and predictors of VDD among Greek adults and to examine its associations with sociodemographic, dietary, behavioral, and metabolic variables using data from the Hellenic National Nutrition and Health Survey (HNNHS). A cross-sectional analysis was conducted among 978 adults (≥19 years) from the HNNHS. Serum 25-hydroxyvitamin D [25(OH)D] concentrations < 20 ng/mL were defined as deficient and ≥20 ng/mL as normal. The median age of participants was 40.2 years, and 62.0% were female. The overall prevalence of VDD was 46.0%, with the highest rate observed among adults aged ≥60 years (62.2%). VDD was significantly associated with older age (p < 0.001), retirement status (62.9% among retired; p < 0.001), low and sedentary physical activity (32.7% and 32.6% vs. 50.8% among highly active; p < 0.001), higher HDL (median 52.0 vs. 49.0 mg/dL among VDD vs Normal; p = 0.001), elevated serum calcium (median 9.4 vs. 9.2 mg/dL among VDD vs Normal; p = 0.020), and lower insulin levels (median 7.5 vs. 8.0 μIU/mL among VDD vs Normal; p = 0.044). Dietary intake (total energy and macronutrients) and body composition were not significantly associated with VDD. In the multivariate model, significant independent predictors of VDD included being retired (AOR = 2.383; 95% CI: 1.596–3.558; p < 0.001), having higher serum calcium levels (AOR = 1.563; 95% CI: 1.078–2.266; p = 0.019), and higher HDL levels (AOR = 1.016; 95% CI: 1.005–1.027; p = 0.001). Physical activity level was also a key determinant; participants classified as sedentary or low active had significantly higher odds of deficiency compared to highly active individuals (AOR = 0.468; 95% CI: 0.319–0.690; p < 0.001). This counterintuitive result may be influenced by factors such as increased indoor physical activity, and warrants further investigation. Dietary intake and body composition were not significantly associated with VDD. The findings underscore the importance of incorporating sociodemographic and lifestyle factors into prevention strategies. Interventions should particularly focus on older adults, retired individuals, even if they have higher HDL and calcium levels, and are physically active.

Design Of A Deployable Rolled Antenna System For Satellite Applications, Ashwaq Abdulla Alkaabi

Theses

This project presents the development of a deployable Synthetic Aperture Radar (SAR) antenna designed for a 16U CubeSat platform. The primary challenge in SAR satellite design lies in the need for large antennas to achieve high-resolution imaging, which traditionally results in increased satellite size and cost. To address this, the proposed solution employs a scalable 4 × 21 patch antenna array operating at 1.275 GHz, fabricated on a flexible Polyimide-based Printed Circuit Board (PCB). This flexible PCB allows the antenna to safely roll during deployment, avoiding damage and facilitating compact storage. However, Polyimide poses challenges due to higher losses and …